Global Patent Index - EP 0342845 A1

EP 0342845 A1 19891123 - Producing half-tone images.

Title (en)

Producing half-tone images.

Title (de)

Halbtonbilderzeugung.

Title (fr)

Création d'images en demi-teintes.

Publication

EP 0342845 A1 19891123 (EN)

Application

EP 89304680 A 19890509

Priority

GB 8811568 A 19880516

Abstract (en)

A method and apparatus for generating a half-tone version of an image represented by a first set of digital data defining the colour content of abutting pixels of the image at a first resolution. The apparatus comprises a radiation beam generator (8); a record medium support (11), wherein the radiation beam and the support are relatively moveable such that the radiation beam scans a record medium (10) mounted on the support in a series of abutting scan lines; a radiation beam modulator (7) for modulating the radiation beam in response to a control signal (CS); and a control signal generator (5) for generating the control signal. The radiation beam is modulated selectively to expose a record medium on the support (11) at a second, finer resolution, the control signal generator (5) being adapted to interpolate the second set of digital data from the first set of digital data and to generate the control signal by comparing the second set of digital data with half-tone information.

IPC 1-7

H04N 1/40

IPC 8 full level

G06T 3/40 (2006.01); H04N 1/40 (2006.01); H04N 1/405 (2006.01)

CPC (source: EP US)

G06T 3/4007 (2013.01 - EP US); H04N 1/40068 (2013.01 - EP US); H04N 1/4055 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

DE GB

DOCDB simple family (publication)

EP 0342845 A1 19891123; EP 0342845 B1 19931222; DE 68911588 D1 19940203; DE 68911588 T2 19940414; GB 8811568 D0 19880622; JP H0271669 A 19900312; US 4989096 A 19910129

DOCDB simple family (application)

EP 89304680 A 19890509; DE 68911588 T 19890509; GB 8811568 A 19880516; JP 11882689 A 19890515; US 35252189 A 19890516